/***************************************************************************
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *****************************************************************************/
package com.taosdata.jdbc;

import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Enumeration;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;

public class TSDBConnection implements Connection {

	private TSDBJNIConnector connector = null;

	protected Properties props = null;

	private String catalog = null;

	private TSDBDatabaseMetaData dbMetaData = null;

	private Properties clientInfoProps = new Properties();

	private int timeoutMilliseconds = 0;

	private String tsCharSet = "";

	public TSDBConnection(Properties info, TSDBDatabaseMetaData meta) throws SQLException {
		this.dbMetaData = meta;
		connect(info.getProperty(TSDBDriver.PROPERTY_KEY_HOST),
				Integer.parseInt(info.getProperty(TSDBDriver.PROPERTY_KEY_PORT, "0")),
				info.getProperty(TSDBDriver.PROPERTY_KEY_DBNAME), info.getProperty(TSDBDriver.PROPERTY_KEY_USER),
				info.getProperty(TSDBDriver.PROPERTY_KEY_PASSWORD));
	}

	private void connect(String host, int port, String dbName, String user, String password) throws SQLException {
		this.connector = new TSDBJNIConnector();
		this.connector.connect(host, port, dbName, user, password);

		try {
			this.setCatalog(dbName);
		} catch (SQLException e) {
			e.printStackTrace();
		}

		this.dbMetaData.setConnection(this);
	}

	public TSDBJNIConnector getConnection() {
		return this.connector;
	}

	public Statement createStatement() throws SQLException {
		if (!this.connector.isClosed()) {
			return new TSDBStatement(this.connector);
		} else {
			throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
		}
	}

	public TSDBSubscribe subscribe(String topic, String sql, boolean restart) throws SQLException {
		if (this.connector.isClosed()) {
			throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
		}

		long id = this.connector.subscribe(topic, sql, restart, 0);
		if (id == 0) {
			throw new SQLException(TSDBConstants.WrapErrMsg("failed to create subscription"));
		}

		return new TSDBSubscribe(this.connector, id);
	}

	public PreparedStatement prepareStatement(String sql) throws SQLException {
		if (!this.connector.isClosed()) {
			return new TSDBPreparedStatement(this.connector, sql);
		} else {
			throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
		}
	}

	public CallableStatement prepareCall(String sql) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public String nativeSQL(String sql) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void setAutoCommit(boolean autoCommit) throws SQLException {
	}

	public boolean getAutoCommit() throws SQLException {
		return true;
	}

	public void commit() throws SQLException {
	}

	public void rollback() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void close() throws SQLException {
		if (this.connector != null && !this.connector.isClosed()) {
			this.connector.closeConnection();
		} else {
			throw new SQLException(TSDBConstants.WrapErrMsg("connection is already closed!"));
		}
	}

	public boolean isClosed() throws SQLException {
		return this.connector.isClosed();
	}

	/**
	 * A connection's database is able to provide information describing its tables,
	 * its supported SQL grammar, its stored procedures, the capabilities of this
	 * connection, etc. This information is made available through a
	 * DatabaseMetaData object.
	 * 
	 * @return a DatabaseMetaData object for this connection
	 * @exception SQLException
	 *                if a database access error occurs
	 */
	public DatabaseMetaData getMetaData() throws SQLException {
		return this.dbMetaData;
	}

	/**
	 * This readOnly option is not supported by TDengine. However, the method is intentionally left blank here to
	 * support HikariCP connection.
	 * @param readOnly
	 * @throws SQLException
	 */
	public void setReadOnly(boolean readOnly) throws SQLException {
	}

	public boolean isReadOnly() throws SQLException {
		return true;
	}

	public void setCatalog(String catalog) throws SQLException {
		this.catalog = catalog;
	}

	public String getCatalog() throws SQLException {
		return this.catalog;
	}

	/**
	 * The transaction isolation level option is not supported by TDengine.
	 * This method is intentionally left empty to support HikariCP connection.
	 * @param level
	 * @throws SQLException
	 */
	public void setTransactionIsolation(int level) throws SQLException {
	}

	/**
	 * The transaction isolation level option is not supported by TDengine.
	 * @return
	 * @throws SQLException
	 */
	public int getTransactionIsolation() throws SQLException {
		return Connection.TRANSACTION_NONE;
	}

	public SQLWarning getWarnings() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void clearWarnings() throws SQLException {
		// left blank to support HikariCP connection
		//todo: implement getWarnings according to the warning messages returned from TDengine
	}

	public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
			throws SQLException {
		// This method is implemented in the current way to support Spark
		if (resultSetType != ResultSet.TYPE_FORWARD_ONLY) {
			throw new SQLException(TSDBConstants.INVALID_VARIABLES);
		}

		if (resultSetConcurrency != ResultSet.CONCUR_READ_ONLY) {
			throw new SQLException(TSDBConstants.INVALID_VARIABLES);
		}

		return this.prepareStatement(sql);
	}

	public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public Map<String, Class<?>> getTypeMap() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void setHoldability(int holdability) throws SQLException {
		// intentionally left empty to support druid connection pool.
	}

	/**
	 * the transaction is not supported by TDengine, so the opened ResultSet Objects will remain open
	 * @return
	 * @throws SQLException
	 */
	public int getHoldability() throws SQLException {
		//intentionally left empty to support HikariCP connection.
		return ResultSet.HOLD_CURSORS_OVER_COMMIT;
	}

	public Savepoint setSavepoint() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public Savepoint setSavepoint(String name) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void rollback(Savepoint savepoint) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void releaseSavepoint(Savepoint savepoint) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
			throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
			int resultSetHoldability) throws SQLException {
		return this.prepareStatement(sql, resultSetType, resultSetConcurrency);
	}

	public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
			int resultSetHoldability) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public Clob createClob() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public Blob createBlob() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public NClob createNClob() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public SQLXML createSQLXML() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public boolean isValid(int timeout) throws SQLException {
		return !this.isClosed();
	}

	public void setClientInfo(String name, String value) throws SQLClientInfoException {
		clientInfoProps.setProperty(name, value);
	}

	public void setClientInfo(Properties properties) throws SQLClientInfoException {
		for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements();) {
			String name = (String) enumer.nextElement();
			clientInfoProps.put(name, properties.getProperty(name));
		}
	}

	public String getClientInfo(String name) throws SQLException {
		return clientInfoProps.getProperty(name);
	}

	public Properties getClientInfo() throws SQLException {
		return clientInfoProps;
	}

	public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void setSchema(String schema) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public String getSchema() throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void abort(Executor executor) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
		this.timeoutMilliseconds = milliseconds;
	}

	public int getNetworkTimeout() throws SQLException {
		return this.timeoutMilliseconds;
	}

	public <T> T unwrap(Class<T> iface) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}

	public boolean isWrapperFor(Class<?> iface) throws SQLException {
		throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
	}
}
